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<div class="titlepage"><div><div><h4 class="title">
<a name="asio.reference.basic_stream_socket.async_write_some"></a><a class="link" href="async_write_some.html" title="basic_stream_socket::async_write_some">basic_stream_socket::async_write_some</a>
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<p>
          <a class="indexterm" name="asio.indexterm.basic_stream_socket.async_write_some"></a> 
Start
          an asynchronous write.
        </p>
<pre class="programlisting">template&lt;
    typename <a class="link" href="../ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>,
    typename <a class="link" href="../WriteHandler.html" title="Write handler requirements">WriteHandler</a>&gt;
<a class="link" href="../asynchronous_operations.html#asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> async_write_some(
    const ConstBufferSequence &amp; buffers,
    WriteHandler &amp;&amp; handler);
</pre>
<p>
          This function is used to asynchronously write data to the stream socket.
          The function call always returns immediately.
        </p>
<h6>
<a name="asio.reference.basic_stream_socket.async_write_some.h0"></a>
          <span><a name="asio.reference.basic_stream_socket.async_write_some.parameters"></a></span><a class="link" href="async_write_some.html#asio.reference.basic_stream_socket.async_write_some.parameters">Parameters</a>
        </h6>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">buffers</span></dt>
<dd><p>
                One or more data buffers to be written to the socket. Although the
                buffers object may be copied as necessary, ownership of the underlying
                memory blocks is retained by the caller, which must guarantee that
                they remain valid until the handler is called.
              </p></dd>
<dt><span class="term">handler</span></dt>
<dd>
<p>
                The handler to be called when the write operation completes. Copies
                will be made of the handler as required. The function signature of
                the handler must be:
</p>
<pre class="programlisting">void handler(
  const asio::error_code&amp; error, // Result of operation.
  std::size_t bytes_transferred           // Number of bytes written.
);
</pre>
<p>
                Regardless of whether the asynchronous operation completes immediately
                or not, the handler will not be invoked from within this function.
                Invocation of the handler will be performed in a manner equivalent
                to using <code class="computeroutput">asio::io_context::post()</code>.
              </p>
</dd>
</dl>
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<h6>
<a name="asio.reference.basic_stream_socket.async_write_some.h1"></a>
          <span><a name="asio.reference.basic_stream_socket.async_write_some.remarks"></a></span><a class="link" href="async_write_some.html#asio.reference.basic_stream_socket.async_write_some.remarks">Remarks</a>
        </h6>
<p>
          The write operation may not transmit all of the data to the peer. Consider
          using the <a class="link" href="../async_write.html" title="async_write"><code class="computeroutput">async_write</code></a>
          function if you need to ensure that all data is written before the asynchronous
          operation completes.
        </p>
<h6>
<a name="asio.reference.basic_stream_socket.async_write_some.h2"></a>
          <span><a name="asio.reference.basic_stream_socket.async_write_some.example"></a></span><a class="link" href="async_write_some.html#asio.reference.basic_stream_socket.async_write_some.example">Example</a>
        </h6>
<p>
          To write a single data buffer use the <a class="link" href="../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a>
          function as follows:
        </p>
<pre class="programlisting">socket.async_write_some(asio::buffer(data, size), handler);
</pre>
<p>
          See the <a class="link" href="../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a>
          documentation for information on writing multiple buffers in one go, and
          how to use it with arrays, boost::array or std::vector.
        </p>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2018 Christopher M. Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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